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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f341dbd97a1b67a41a288787727457e76993e2cc03118f15636f82712364fb' 
  AND token = 'doGWjNwJai+bQAKk/NtzmSk4vihF0sXx7oGT1kaocDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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