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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e410abae04d34b75c065556371278311d9a1db4721ff53de9b66496a5836646' 
  AND token = '/9YTRpLBHU2gEX5uYL9PXpM206DE0SWcnzjIM3IRB2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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