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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfef7fb5d1626f015424cb80915aaae9772e6c5dcd89cf7f69b0fc6a2e95b173' 
  AND token = 'bvssDc3vsSl7jwYewPimZiitu2uqhi7Zs1bt0yanHXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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