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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38a2b37275162753d5a575c245afb2f6381341409e8c53604d703b806b81319' 
  AND token = '/t/K98UobGXlf5P1cED1BxTO3ZC+7gZ7UUR6K7NM/zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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