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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3723f0c8f6caf0f3d5c5ca74dd582889b2c64672403f28da46edf7a97c6bb4c' 
  AND token = 'ZCV8BnOXFIh+3cwBOXOdndofr5a3vadUonR30DcIQIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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