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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c05fc4c2e11f092115674956b10699d0370ecbd5a8f4d740e9596cc76955e2' 
  AND token = 'gq2OkXca8XXSUcBWRc9eVOUP5FtCm8lSKzSfE6ZDmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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