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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1183a2b326b65a870321f52134889dea1a7f25ed71f4b6b0d4462cbf6eb387' 
  AND token = 'omyqNFh74f6H/D3+JJoLxwxxr78N7X+/7wO0eFeRd9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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