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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc42d7e3aedcdc26a5396af737cd6075e6aa30f13ffae2806b3b3911aeb57ce' 
  AND token = 'bEgp5tYZR2XKenYEM+qdma+VmAuw3TG3KLRzbGYeLR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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