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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97839c776c8a5cd5c664b1c63820d6c70ce79cf385d2c6a6a8f7f4af96f62ae' 
  AND token = 'PfLFuBVNt2UvVZQvvNyEHtCBuHgboX4AZJUUnaM2/Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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