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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41b94a597610039c6dd8d7bc4e16e72d7a0d81e5438f82224ae90ec26f6ee64' 
  AND token = 'pCq1/dXm5C5uOUlMr+7lWmfX9Wvu+iycPcuOrimCeOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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