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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5165a8f53d17936b782a5e3840daabcf4b2ba7ef8fb8dc784b810387caeeb2b0' 
  AND token = 'sJfnbMU4XVbTRBpEQUiYGnj1tCSsOy0isjHyemxClr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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