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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97a32f209d3bf92d0ede2670571c53b103b3cae8ff9001410449e654a6b7c73' 
  AND token = 'ySNcRbU/D/OojU5BokbopkXS2eR+F8pIpJkoOuK5cAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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