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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52464730ced57e583e8eff09a56e47f292ee0de57ecf05b0c4800b8601d3344' 
  AND token = 'DihX9GQ5tGhVqntbK+qgwraFUs9Oi8ES7xIPqWFZDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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