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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60af951adc74098a1419dfc9962b4a0cbc744abff6660482e3be3a237989f19c' 
  AND token = 'Bdj8ehA3hYzsMzw1odEWyl1TcXEo7bjqTCz2ciVEDBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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