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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e1293dccbb2d0964935491c8c8b954b5b992a27ae421119945b18a13a2447b' 
  AND token = 'USRkTR0QtaAXybw2yNJM/uokam0HERXFKzuF1cqTgw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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