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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc0c8fb4a293f07395e6e9a57f8fb640115459377a0d99ec599c5ceb2af3e85' 
  AND token = 'u3IQcRWU30yY4rgr8qvuPAGOZATxDbIccImdc4/rctk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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