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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395c6f26ba60a908407f3896e6ae0231ccd98cfbea03fb0b0b7a8ffd85b4aaa6' 
  AND token = 'G2eX3D1HYDX27guQ3rwWkOM3ojzTOnr0pVuPKrTWL/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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