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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cf247e1605db34eaea3cfd10c7442fa7f1becc71b6763cfeaf21face2ffe91' 
  AND token = 'yXZ+74MVwniKB7TaY0GNXy9o1D5MIqityvhW2wz5kcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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