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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d6df0d82a8728054e5ebd8f3fa7f643f89629c776f1bedcc77fdd39d5aaa5b' 
  AND token = 'FccppgYWNLVRWvdWaLI93J9J+mH1cjEWemboDcI4LpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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