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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fb532f8502b870e1343f1aec27aeb6637fc75e6782cc7c78bdbb29b8de608a' 
  AND token = 'wh5nDjHQH4i6lNyTjJIlIdZNAtWjMBUDdzKg+H87x0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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