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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef755053f737e0aa8c204109f0dfa33c8cea30a6904c28ed4e2f3487733715a' 
  AND token = '/1e97QznzQuTqIB3DYDqtz2vzRD62yGYNp1OLjxa+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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