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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93f133884cbc52727766215e27dd5e10b4d7ee070445f0253dffa81245c7021' 
  AND token = 'q6h0OmSVXn1PVHtRVV4Nmbdyv8Egw109ECtSyBC2fdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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