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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ba4dff74295b6400372e53c9b505984b823868fce6e0315e0e229ec253531f' 
  AND token = 'EaxpxI4YiSgwRMoq4+p9cjSGwM7CnYy263TeI7iwOGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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