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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd7b0a4f5987cf1a0b53385b65ebde56c808f60e57233b84582f8cda823066d' 
  AND token = 'EjO/Z9xvCEl3MMESA/RA+tw28hyQWxACFvV+dXCiPYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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