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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac5c8e0ce2c6451374efcab44bfad4ed59bc2511dc6d30eaf728ee655c58daa' 
  AND token = '79aSoNfhJGLKm5w3UcDYYudaOwmwo5WLk3dS1hjtdtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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