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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edd47fcc792124291c9233541dac64d76f46d2700a92ca62f62b0b947de399f' 
  AND token = 'OO5adETeD+KpK1oNoubh1zUB49Py/MXgLKm5ho8lQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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