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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee829929f9275c3731cd4c2a253a13a47991aeaaf36965e09a4ab8f3adf4a704' 
  AND token = 'reEFyVHnJzn/1ZX+WNe6mcdsEWSY3hk6biQd/fttwZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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