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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0dad8809582d1277638589c33170ef6143d50c631ce7e9947922990730135f' 
  AND token = 'CP9/cZvvktEp3mc1jNJR5NAYdU4JMZVwJMz5R0A7Phg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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