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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61268dc6153c2671814d33957e8dad90cc36a91ea400c14276b7cb76f69e5a30' 
  AND token = 'VD2rB51+7J7cVbL0GSXAgmB5vdD3mE1GIhF7O9Lj7ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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