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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8332eb87b00d95dd7bb0ab7a45b66abc3c003537201fa449378d62c1a5bc0ef3' 
  AND token = 'wULWmniRr0eaaRcgH/yRZuEIwFLeGkU1ajpTI+zL9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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