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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f16bfca50fcca6747228ea2fd5d1963ea26b2a5d9baac4c0ada296def77f247' 
  AND token = 'miMaznLxefeFWyDm0OHwpiY4zsL9n+wbOdPX9mEuvwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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