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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e759df302ee1d46787bcf2d4affa85094b50c6d93540861338cd991c07820b0' 
  AND token = 'R4GqAx/MdNXwlnoeCLjpM3HbFrYAfqjfIYXz7KQH9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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