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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f0f09aba465ef0d3017dcdffa380318f8550ca402d130816e7146b668ff259' 
  AND token = 'Q44OkXLna6oUgaTYZJS1AxD6ln0GZRZeu51JtIG8FFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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