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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d71a214525ca5d54f9d0bf124e1a14970ae07bcf91e9e29a680215d35eb29c1' 
  AND token = 'Efa7dV/HODt4qlr12BiNUM5JhkrGu/Cnpi0HAUfHjNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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