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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d98919fa58a9bb01d4600a0427cd360d1c7169e7a497428a5d1334128f60d' 
  AND token = 'FmVGfq40IMreWpcOkCFLNvKdBckL8uo6PIHP9CzHFkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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