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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78eda42f6baf0b71ad6da9c11e7adee33808025cfce57f63557ba73bb68e882' 
  AND token = '4cNgGqWG2hkgfQqaMc4xDBJcm1MU7KyH91BoW4JFRyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}