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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6221ccae4a7633aba119f7f714dbc935cf4677ee7b17a34a90abafccfe4ba3' 
  AND token = 'oRmN8TPZzHds4V7D+4rVFaegLgodm76x/rlBpR3u/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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