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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8173d797b2b6c378a40c0b44ef9e4d177e45abfc303f6e6e72eec5df9a96dd' 
  AND token = 'vjmSQ87peliZf9WWRCthXbim+kxrTVy+EFZrsMBnKHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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