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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cb28f04971a2530020fe3656223faea58f35ac4a36fad1bc088c8cde80934a' 
  AND token = 'fGUwg1dNoa9C7YT6Zky7bJ8nXO98XN5mR6cXrkl7wkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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