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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c60eb5a9fb74662faf68fcebb5113a274518434d6cb56bbb50c6cebbbfd7fd' 
  AND token = 'G/CLFYzVSFsj6JtcVkA2zRXG+L4dKEo8UIBiHcyabHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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