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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6e31f3dd75d3511d9aad4b992bf4965b0a4e14ca1afaa0d2feb9b33eff69f7' 
  AND token = 'tIEGLuMg8PN8JsHEkKz1+7VCv3bMuMGvPFiJtFbAzg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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