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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8a6d32686c7307efdf8180cc8089eae8e9c664523d55cf6ba40087ca990437' 
  AND token = 'aYU/h+C/Et8kd0fLSl2lfO6IBEMXR8u9sXqEJeat1Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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