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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1f5b0ae0fcf046b347a6d09d6eabaa6f554f102e4e5a1d0793b0474ffd7ae5' 
  AND token = 'aeCNe6wonF9OWfzSk2fQZXpJebFMiv+cVGZH4/bSeww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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