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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9778c84c542f97d26ca96b73bd0bd1a9935faa2b441baaeb5d21d89831a9cfb' 
  AND token = '4YAdjxGj8g9O8IYavd0YQYUbfii7FzgrAAUKRVSJDCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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