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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9329c89d77e59f3bdc05921588bc991baf1f8a134540a788770d6f4341f0833' 
  AND token = '/B67baFI2A2/AKMUCJckNE48BkUac5Lr4/mOWoerRis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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