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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f549b6a5d2aa6b8dfaaa13bd98dc487857f9c3f3a8429c66097e27190f72f760' 
  AND token = '5bC74gSFySXoahoqDD7ABeJyGuE76/8b+L1nS8UWZF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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