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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f999cd6bf00c33d780ea3bd3ac3d7e94d6db6fe0f57d410d4fbcc685631280' 
  AND token = 'hN7l2dZ+h9HHK1p4+XKU59Vph4B8L6mXWNaMWPbcj4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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