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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88481399ba5e0834f0a225ddf61e00ffa730a020d43300076d8648fc8e226680' 
  AND token = 'SO1AoXycGQ+GdW6iNwVTXzVR7yp6MGThNE3oRz/i8vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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