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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b71b09a7f5c55cd9d5df62bd88e6d2263c97909d6552b3c626e6dde8899b9f3' 
  AND token = '97U4OG6qrDQcXbQ+ert4PrI9Nb97rS5JovbNU1DD+lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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