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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa38cdcaf5b93fbd1700b2cdb35422f1e7ff1ccacc8e16904099f6f88cd586e' 
  AND token = 'Xq8SCCCE+zeac+ZEuDPDhRVb1fQ2XzQaTOp9JNnMiio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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