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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e142f9a5b0de465560777a46894db4b3949736ac057659f54ac67f4fdd960a12' 
  AND token = 'xbi9zWG3fdx02Uzk3mJVicehnnbUC5eyq7kFzfPwcQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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