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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06c4668dfca24a27060005b4ed3a7433176dba54b2ee240135069787a1aeb11' 
  AND token = 'neNwNwWy/zyp3NlZFJUFtiwHm2IsoCQ33Rr2adtUpvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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