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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c304c1a081bc7d673f55c133b57e30352f1808542a0b71127bfce85d5f129b2' 
  AND token = '2k5BvKjCrs6O9u7cqxcK1usHrLg8kMI45pS+4MCUFcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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