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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb79760a03e0303ab95a6aa50b3cc3b58478f531c00c976c784c659b7167605' 
  AND token = 'rgQPXE5ps8h9Kc9F/o21d1e5X0AkDikyDX2xdkRmq+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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