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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852f1e8ac593a4ba8096f12cacfaa3ef67d8e99ca9a0adfc01c4196a11141f89' 
  AND token = 'yTT8QyFN8yD+oaT6diMjfnTa1UdDRgp5y3rFywoswtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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