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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309368270864bdbd575ac7805f6168cae3bbbb3b66538a660d1b0ad98312eb58' 
  AND token = 'xaPK5yGaRG6ppFfwoVj0G9714Z5QCWXdqaNdB3qYBv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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