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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d48128c11e2eee92e80fef4588de53950e2509087f5c59064310cb03d9447ea' 
  AND token = 'RZ7R1QSnUxHy6Ib3NJlOjRLGOKy9cQZ99GtxU5O9T5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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