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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da967bb8936ecb2d587dcab12b967e22b6184798d87a2c2cdd71bac9a7c96764' 
  AND token = '4fmgSUtOZ2mCTLfqtrA802qRFhlYzE5c65NwHlJEXA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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