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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d2da6cef9a7f4f2229af5b11f374f12d2a3676934fdf59baae07a82b23fdcb' 
  AND token = '/Q/qmXQnF6S11idAp2VRZ06ZJI6dPMleP8u0ITNz8tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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