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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aaeb87f432330480a5721380619f7e4ee94099131a0f4407f796fa3b44e58ac' 
  AND token = 'W+G45GcPCH4aVZnBwRZMNt7+o1veIStsBdt2XMSHhWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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