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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db15facf92f7c4a631ca08e8decc77c615926585ac57ff1d00c83e2ebbacc682' 
  AND token = 'tJgfh7ViftK/x21iDQtTqz2Tapb1Ly8MNErnU6inVH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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