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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09330239f0d363e397001381ce5c2d891a0d94e9bb0e0b57888731753cf00709' 
  AND token = 'q/vYfNVShTCU4C0rJme0ghOP2aKEOPBet3re4g4tkzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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