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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c275948d7ba6c5a958432ae2fa89acc71644d8391c950479d80918b7901cdf14' 
  AND token = 'VVVjGMIX09hTCCsi3tQZ9snlWR0jDZvguO9V4cejeB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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