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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382df83f314de2f4f728a25661e83ff379ffa9958bf829414e96e5f431cac130' 
  AND token = 'W/2eoQGpal2eT9QWAbpHOErBQHz1Nm5G4/3+BhbSQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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