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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe89d98b262aa772a4bdb9ced68fd006ffaa93065b2da27a066a261babcf018' 
  AND token = 'uF5iOOsdVS4BxXXjIHoWp2FibRAeFiumOxzGPu7Yv64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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