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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e184fb002c94052d03d9131777f638f2ece891b0eb383b2f23fb4847b67820b3' 
  AND token = '4Y6FI7rxAU0voC5jT9wmwqQLJOmXjf2brsb7m+SMf5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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