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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80615c2a7f755978b1ea0f914a100d5616d622581003dcc415f3e9534cb5ed4d' 
  AND token = '15S8Fs2ZxgASGoclKhp3Pd3l/hpxDzewU9JSAaSzpPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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